Pipe-coupling



H. L. LIBERTY.

PIPE COUPLING.

APPLICATION FILED MAY 29, 1919.

1,334,306. Patented Mar. 23, 1920.

."ll'l llil'" ED STATES PATENT OFFICE.

HARRY L. LIBERTY, OF DULUTH, MINNESOTA.

PIPE-GOUPLING.

ill) all whom it may concern Be it known that I, HARRY L. LIBERTY, a citizen of the United $tates, residing at llllllltll, in the county of fit. Louis and State o l? lllinncsota, have invented certain new and useful lniprorenients in Pipe-Couplings, of s-xhich the :lollmving is a specification, refer ence being had therein to the accompanying drawing.

This invention relates to pipecouplings and has special reference to a coupling for has and other like metal pipes.

The principal object is to produce a mupling that will permit of the ends of pipes being securely coupled without being th leaded.

Another object is to produce a coupling this character which will permit of pipes different diameters being successfully coin led and wherein the end of one pipe .may he threaded, or not, as desired.

l lther objects and adwmtages of the peculiar construction will appear in the further description of the invention.

Referring to the accompanying drawings forming part of this application and in which like reference characters indicate like parts Figure l is a central vertical sectional View through one of my improved couplers uniting the ends of two pipes of different diameter the larger one being threaded and the smaller one not l ig. is a similar view of two pipes of like (lltlliQtQl being coupled and. not threaded,

l ig. 3 is a perspective view of the end of one of the threaded bushings employed in the no rel coupling,

Fig. l: is a perspective View of one of the do employed in the coupling, and

Fig. 5 is an elevation of one end of one of the pipes as it appears prepared for application of the coupling.

1 represents a common internally threaded plain coupling which is usually screwthreadedly attached to the abutting ends of two pieces of pipe and in Fig. l I have illustrated one such piece of pipe, at 2, being inserted. within the coupling '1. in tl e usual manner. At 3 is shown the end of a piece of pipe of smaller diameter preriously prepared for application of the coupling by having formed an annular rectangularshaped groove at spaced inwardly from the extreme end thereof, this being the only Specification of Letters Patent.

Patented Mar. 23, 1920.

Application filed May 29, 1919. Serial No. 300,632.

essential preparation of the pipe f0 application. to the coupling.

.ifbout the end of the pipe 3 and intermediate of it and the coupling 1 is inserted the externally scrcw-threaded gland 5, carr in within its inner end the, preferably, four diametrically opposed dogs 6,' they be ing mounted within suitable slots 7 formed. in the end of the gland. and the outer surfaces of the dogs are screw-threaded to correspond to that portion. of the gland of which they form a part. These dogs are held in position within their respective slots by having holes formed through the ends thereof, into which. the spring wire ring 8 is threaded, said ring reg coring with and engageable in the annular groove 9 formed in the end of the gland which temporarily holds the dogs in place when not surroiuided by the union or coupling 1.

In Fig. 10 represents a piece of pipe. similar in all respects to the pipe 2'},- held in place within the union 1 by the gland 11 and dogs 6.

Intermediate of the adjacent ends of the pipes, either 2 and 3 or 3 and 10, is installed a suitable washer 1.3 of rubber or soft metal. as the case may require, for insuring a tight joint between the ends of the pipes and this "usher may be either screw-threaded within the coupling 1 or may be made to slip in loosely, preferred.

It is apparent that by this construction. when the glands are slipped over the ends of the pipes previously prepared with the groove -ltherein for their reception the catches 12 on the ends of the do s 6 will become engaged within said groove and any subsequent longitudinal movement of the glands will carry the pipe with thorn. hen

the glands are then inserted within. the coupling by being screw--thrcaded therein. the dogs will be firmly hold in place and the two ends of the pipes being coupled may be forced to any desired degree against the intermediate washer to form a tight joint between the ends of the pipe.

From the foregoing it is evident that l have devised a simple form of coupling and while I have shown. a specific form of con struction, it is to be understood that inedifications within the scope of the claims may be resorted to without departing from the spirit thereof.

Having thus described my invention, what and I claim as new and ters Patent, is: V

1. In a pipe coupling the combination with an internally screw-threaded portion, of an externally screw-threaded gland earrying a plurality of pivotally supported dogs upon the end thereof insertible within the internally screw-threaded portion, and a pipe having an annular groove formed in the circumferential surface thereof, adjacent the extreme end and cooperatively engaged by the dogs.

A pipe coupling comprising an internally screw -threaded central portion, e ternally screw-threaded glands insertible Within the central portion from both ends thereof, a plurality of pivotally supported dogs carried Within the end of each gland which is insertible Within the central pordesire to secure by Let tion, pipe Within each gland having an external annular recess therein engaged by the dogs and a packlng washer lntermedlate pipes, substantially as are moved either back or forth within the encircling member, the pipes are eorrespom lingly moved.

In testimony whereof I have hereunto aflixed my signature in the presence of two witnesses HARRY L. LIBERTY. Witnesses:

S. GEO. STEVENS, C. M. OUELLETTE. 

